Main mathematic models used in lage scale data processing of combined adjustment of national astro-geodetic network and GPS2000 network are discussed,an effective arithme-tic for large scale sparse matrix resolution also introduced here.
介绍了天文大地网与GPS2000网联合平差数据处理中的主要数学模型、大规模稀疏矩阵的有效解算方法,用Helmert方差分量估计算法进行地面网的方差分量估计,并用该方法对我国天文大地网的观测数据及空间网数据进行联合平差,得出全网平均点位的点位中误差为0。
The combined adjustment of astro geodetic and space geodetic networks is of great significance for checking, controlling and strengthening the astro geodetic network, and for establishing and extending the geocentric coordinate system.
天文大地网与空间大地网联合平差 ,对于检核、控制与加强天文大地网以及建立与扩展地心坐标系 ,都具有重要意义。
Transformation of Astro-geodetic Network Coordinate System into China Geodetic Datum 2000
天文大地网坐标系统到2000国家大地基准的转换
On the problem of re-adjustment of controlnetwork of low class under the constraintof astro-geodetic network
天文大地网控制下的低等网点重新平差问题
THE SOLUTION OF LARGE SYSTEM OF LINEAR EQUATIONIN THE ADJUSTMENT OF ASTRO-GEODETIC NETWORK
天文大地网平差中大规模线性方程组的解算
COMPUTATIONAL METHOD FOR THE FIRST WHOLE ADJUSTMENT OF CHINESE ASTRO-GEODETIC NETWORK
我国天文大地网首次整体平差计算方法
A primary program for the Combined Adjustment of Astro-geodetic and Doppler-satellite Nets in China
我国天文大地网与卫星多普勒网联合平差的初步方案
astrogeodetic plumb line deflectio
天文－大地垂线偏差
Astronomers have breached the powerful armor of the earth's atmosphere.
天文学家摆脱了地球大气的严重束缚。
Radio astronomy has greatly increased our understanding of the universe.
辐射天文学大大地增进了我们对宇宙的了解。
He spends most of his time online chatting with friends all over the country.
他上网的大部分时间是在和全国各地的网友聊天。
Undergraduates Interpersonal Relations from On-line Chatting--A Survey on Seven Universities in Wuhan City;
从网上聊天看大学生的网络人际关系——对武汉地区七所高校的调查
Philippine Atmospheric, Geophysical and Astronomical Services Administration
菲律宾大气、地球物理及天文服务管理局
Atmospheric Refraction and Building a Local Observational Model
测定瞬时天文大气折射值和建立本地实测模型
Undergraduates Moral Education under the Network Culture Background;
网络道德教育在大学文化建设中的地位和作用
Depended on the Enormous Net to Hold Back the Great Wave;
庶凭弥天网 用回大海澜——从《畅志诗》看文廷式前期思想
The work of this paper may offer some reference and gist for research on astrometry and geodesy.
本文的工作可为天文大地测量的研究提供一定的参考和依据。
The Internet is progressing without pause, demanding companies to run 24 hours per day.
互联网在大踏步地前进,要求公司每天24小时运作。
Today's LANs and internetworks provide only a single service to the desktop: best effort delivery of datagrams.
今天的局域网和互联网对桌面系统只提供单一服务：最佳地交付数据报文。
INTERNATIONAL YEAR OF ASTRONOMY:ONE EARTH,ONE SKY
国际天文年:同一个地球,同一片星空——2009国际天文年清华大学活动纪实